<template>
  <div class="login">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="login_avatar">
        <img src="~assets/logo.png" alt="" />
      </div>
      <!-- 登入表单区域 -->
      <el-form
        label-width="0px"
        class="login_form"
        :model="loginForm"
        :rules="loginFormRules"
        ref="loginFormRef"
      >
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input
            prefix-icon="el-icon-user"
            v-model="loginForm.username"
          ></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input
            type="password"
            prefix-icon="el-icon-lock"
            v-model="loginForm.password"
          ></el-input>
        </el-form-item>
        <!-- 按钮 -->
        <el-form-item class="btn">
          <el-button type="primary" @click="login">登入</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  name: 'Login',
  data() {
    return {
      // 表单登入绑定对象
      loginForm: {
        username: '',
        password: '',
      },
      // 表单登入规则验证对象
      loginFormRules: {
        // 验证用户名是否合法
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          {
            min: 3,
            max: 10,
            message: '用户名长度需在 3 到 10 个字符之间',
            trigger: 'blur',
          },
        ],
        // 验证密码是否合法
        password: [
          { required: true, message: '请输入登入密码', trigger: 'blur' },
          {
            min: 6,
            max: 15,
            message: '密码长度需在 6 到 15 个字符之间',
            trigger: 'blur',
          },
        ],
      },
    }
  },
  methods: {
    // 重置表单
    resetLoginForm() {
      this.$refs.loginFormRef.resetFields()
    },
    // 登入预验证
    login() {
      this.$refs.loginFormRef.validate(async (valid) => {
        if (!valid) return
        // 请求登入数据
        // 解构数据
        const { data: res } = await this.$http.post('login', this.loginForm)
        // console.log(res)
        if (res.meta.status !== 200) {
          // 设置失败弹窗
          return this.$message.error('登入失败！')
        }
        // 设置成功弹窗
        this.$message.success('登入成功！')
        // 将登入成功后的 token，保存到客户端的 sesionStorage 中
        window.sessionStorage.setItem('token', res.data.token)
        // 进行页面跳转
        this.$router.replace('/home')
      })
    },
  },
}
</script>

<style scoped>
.login {
  background-color: #2b4b6b;
  height: 100%;
}
.login_box {
  width: 450px;
  height: 300px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  border-radius: 5px;
  background-color: #eee;
}
.login_avatar {
  position: absolute;
  width: 130px;
  height: 130px;
  border-radius: 50%;
  padding: 5px;
  border: 1px solid #ccc;
  box-shadow: 0 0 10px #bbb;
  background-color: #eee;
  left: 50%;
  transform: translate(-50%, -40%);
}
.login_avatar img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
}
.btn {
  display: flex;
  justify-content: center;
}
.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}
</style>